With Hardhat

Let's go through the process of deploying a smart contract on Ethernity Chain using Hardhat and TypeScript.

Requirements

• Node.js and npm: download and install both packages here

• Ethereum Wallet: Metamask or any other non-custodial Ethereum wallet, since you will need the private key

• ETH: You can get some Sepolia ETH and then bridge it to Ethernity

• Solidity and CLI knowledge

1. Initialize a Hardhat TypeScript project

Open your terminal and create a new directory for your project, then navigate into it:

mkdir hello && cd hello

Initialize an npm project:

npm init -y

Install the necessary packages for Hardhat and TypeScript:

npm install --save-dev hardhat ts-node typescript @nomiclabs/hardhat-ethers ethers

Start a new Hardhat project with TypeScript:

npx hardhat init

When prompted, make the following selections:

• Choose "Create a TypeScript project".

• For the .gitignore prompt, select "Yes" (or y).

• For installing the projects dependencies select "Yes" (or y).

npx hardhat

888    888                      888 888               888
888    888                      888 888               888
888    888                      888 888               888
8888888888  8888b.  888d888 .d88888 88888b.   8888b.  888888
888    888      88b 888P   d88  888 888  88b      88b 888
888    888 .d888888 888    888  888 888  888 .d888888 888
888    888 888  888 888    Y88b 888 888  888 888  888 Y88b.
888    888  Y888888 888      Y88888 888  888  Y888888  Y888

👷 Welcome to Hardhat v2.18.2 👷‍

✔ What do you want to do? · Create a TypeScript project
✔ Hardhat project root: · /Users/Ethernity/hello
✔ Do you want to add a .gitignore? (Y/n) · y
✔ Do you want to install this sample project's dependencies with npm (@nomicfoundation/hardhat-toolbox)? (Y/n) · y

2. Write a Smart Contract

In the contracts directory, delete the sample smart contract Lock.sol and then create a new file named Hello.sol:

Copy

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

contract Hello {
    function hi() public view returns (string memory) {
        return "Hey there!";
    }
}

3. Configure Harhdat for Ethernity

Edit the hardhat.config.ts file to include Ethernity Chain Testnet settings:

import "@nomiclabs/hardhat-ethers";

import { HardhatUserConfig } from "hardhat/config";

const config: HardhatUserConfig = {
  networks: {
    ethernity-testnet: {
      url: "https://testnet.ethernitychain.io",
      chainId: 233,
      accounts: ["PRIVATE_KEY"] // DO NOT SHARE THIS!
    }
  },
  solidity: "0.8.0",
};

export default config;

Replace PRIVATE_KEY with your Ethereum wallet private key.

IMPORTANT: Do not push your hardhat.config.ts file to github or share your private key with anyone.

4. Compile

Compile the smart contract:

npx hardhat compile

5. Deploy

In the scripts directory, create a new file named deploy.ts:

import { ethers } from "hardhat";

async function main() {
    const Hello = await ethers.getContractFactory("Hello");
    const hello = await Hello.deploy();
    await hello.deployed();
    console.log("Hello deployed to:", hello.address);
}

main()
  .then(() => process.exit(0))
  .catch(error => {
    console.error(error);
    process.exit(1);
  });

Now you can deploy the smart contract to Ethernity Testnet:

npx hardhat run scripts/deploy.ts --network ethernity-testnet

6. Check

See your smart contract's deployment on the Ethernity Testnet block explorer (ERNScan): https://testnet.ernscan.io. Enter the contract address from the command line in the search bar to see the details.